Marine diesel lubricant oil compositions

Pending Publication Date: 2019-08-22
CHEVRON ORONITE TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes the use of a special ingredient called a Mannich reaction product in lubricating oils. This ingredient is made from a combination of a polyisobutyl-substituted hydroxyaromatic compound, an aldehyde, an amino acid, and an alkali metal base. When used in marine diesel lubricating compositions, this ingredient can improve properties such as oil thickening, detergency, and prevent metal-based reactions that cause damage. Overall, this special ingredient can make lubricating oils more effective and stable.

Problems solved by technology

Unfortunately, the basicity of the marine cylinder lubricant can be diminished by oxidation of the marine cylinder lubricant (caused by the thermal and oxidative stress the lubricant undergoes in the engine), thus decreasing the lubricant's neutralization ability.
As a result, manufacturers are now designing marine diesel engines for use with a variety of fuels including non-residual gaseous fuels (e.g., compressed or liquefied natural gas) and high quality distillate fuel, to poorer quality intermediate or heavy fuel such as marine residual fuel with generally higher sulfur and higher asphaltene content.
For instance, piston deposit control in marine engines running on low sulfur fuel is especially challenging as it has been found that even additions of high amounts of high soap containing detergents has not lead to the level of desired piston deposit control.
A decrease in the lubricant's neutralization ability due to oxidation can be especially problematic for marine lubricants designed for use with marine engines running on low sulfur fuel.
Because hydrocracking results in a viscosity loss of the base stocks, marine oils generally cannot be formulated solely with hydrocracked base stocks, but require the use of significant amounts of bright stock.
However, the reliance on bright stock is not always desirable because of the presence of oxidatively unstable aromatics.
In addition, the availability of brightstock is diminishing, resulting in high volume uses such as those for marine engines, requiring alternative solutions to impart the desired viscometrics in lubricants.
While foaming is desirable in certain applications, such as floatation, washing and cleaning, it can be undesirable in lubricant-related applications where foaming can be an impediment because it leads to ineffective lubrication.
Low-viscosity oils produce foams with large bubbles, which tend to break quickly and be minimally problematic.
However, high-viscosity oils, such as those used as marine lubricants, generate stable foams that contain fine bubbles and are difficult to break.
Over time, foaming may also accelerate oxidative degradation of the lubricant and in addition may have effects on the transporting and pumping ability of the oil.

Method used

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  • Marine diesel lubricant oil compositions
  • Marine diesel lubricant oil compositions
  • Marine diesel lubricant oil compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0186]The cylinder lubricant of Comparative Example A was duplicated except that Example 1 further contained about 1.0 wt, % of a Mannich reaction product (a reaction product of a polyisobutyl-substituted phenol prepared with a 1,000 number average molecular weight polyisobutylene having greater than 70 wt. % methylvinylidene isomer, sodium glycine, and formaldehyde, having about 45 wt. % diluent oil).

example 2

[0187]The cylinder lubricant of Comparative Example A was duplicated except that Example 2 further contained about 5.0 wt. % of a Mannich reaction product (a reaction product of a polyisobutyl-substituted phenol prepared with a 1,000 number average molecular weight polyisobutylene having greater than 70 wt. % methylvinylidene isomer, sodium glycine, and formaldehyde, having about 45 wt, % diluent oil).

example 3

[0188]A ISBN, SAE 50 viscosity grade fully formulated marine cylinder lubricating oil composition was prepared comprising majority amount of Group 1 base oil, mixture of XOM Core 150N (1.71 mass %), XOM Core 2500BS (24.64 mass %) and XOM Core 600N (41.21 mass %), a high overbased calcium sulfonate detergent, a low overbased calcium sulfonate detergent, a medium overbased calcium sulfurized phenate detergent, aminic anti-oxidant, foam inhibitor, about 0.19 wt. % ethylene carbonated post-treated bis-succinimide dispersant derived from 2300 MW PIB and about 5.0 wt. % of a Mannich reaction product (a reaction product of a polyisobutyl-substituted phenol prepared with a 1,000 number average molecular weight polyisobutylene having greater than 70 wt. % methylvinylidene isomer, sodium glycine, and formaldehyde, having about 45 wt. diluent oil).

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Abstract

A lubricating oil composition includes a major amount of an oil of lubricating viscosity and about 0.1 wt. % to about 10 wt. % actives, based on the total weight of the lubricating oil composition, of at least one Mannich reaction product prepared by the condensation of a polyisobutyl-substituted hydroxyaromatic compound, wherein the polyisobutyl group is derived from polyisobutene containing at least about 70 wt. % methylvinylidene isomer and has a number average molecular weight of from about 400 to about 2500, an aldehyde, an amino acid or ester derivative thereof, and an alkali metal base. The lubricating oil composition can have a TBN of 5 to 200 mg KOH / g. The lubricating oil composition is a monograde lubricating oil composition meeting the specifications for SAE J300 revised January 2015 requirements for a SAE 20, SAE 30, SAE 40, SAE 50 or SAE 60 monograde lubricating oil.

Description

TECHNICAL FIELD[0001]The present invention generally relates to lubricating oil compositions for marine diesel internal combustion engines.BACKGROUND OF THE INVENTION[0002]Marine diesel internal combustion engines may generally be classified as low-speed, medium-speed, or high-speed engines, with the low-speed variety being used for the largest, deep draft marine vessels and certain other industrial applications such as power generation applications.[0003]Low-speed diesel engines are unique in size and method of operation. These engines are quite large and typically operate in the range of about 60 to about 200 revolutions per minute. A low-speed diesel engine operates on the two-stroke cycle and is typically a direct-coupled and direct-reversing engine of “crosshead” construction, with a diaphragm and one or more stuffing boxes separating the power cylinders from the crankcase to prevent combustion products from entering the crankcase and mixing with the crankcase oil. Marine two-s...

Claims

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Application Information

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IPC IPC(8): C10M159/16
CPCC10M159/16C10M2219/046C10M2207/028C10M2207/26C10M2217/043C10M2215/04C10M2215/28C10N2210/02C10N2220/022C10N2220/021C10N2230/02C10N2230/04C10N2230/52C10N2240/102C10M2203/1006C10M2203/1085C10M2207/262C10M2215/064C10N2020/04C10N2020/02C10N2030/04C10N2030/10C10N2030/02C10N2030/08C10N2040/252C10N2010/04C10N2060/00C10N2020/081C10N2030/52
InventorBOONS, CORNELIS HENDRIKUS MARIACLEOPHAS, THEODORUS CONSTANCE
OwnerCHEVRON ORONITE TECH BV